CN101582875A - Method, system and device for data transmission in direct access path - Google Patents

Abstract

The embodiment of the invention discloses a method, system and equipment for data transmission in a direct connection path. The method is applied to a first STA and a second STA that have established a direct connection. Parameters of electrical transmission; the first STA generates a response message according to the transmission stream parameters and sends it to the second STA; the first STA and the second STA use the power saving mode according to the transmission stream parameters data transmission. By using the embodiment of the present invention, the reserved power-saving transmission mechanism is realized on the direct connection path, which ensures that the STA can enter the power-saving mode and can guarantee QoS during the direct connection transmission, and saves the energy of the STA in the case of direct connection consume.

Description

Method, system and device for data transmission in direct path

technical field

The present invention relates to the technical field of communications, and in particular to a method, system and device for data transmission in a direct connection path.

Background technique

In the 802.11 standard, a device supporting the 802.11 protocol is called an STA (Station, station). The network formed by any number of STAs through the 802.11 protocol is called BSS (Basic Service Set, Basic Service Set). An STA can support the AP (Access Point, access point) function, and the STA at this time can be directly called an AP. A STA may not support the AP function, and the STA at this time is called a non-AP STA (non-AP STA). Hereinafter, non-AP STAs are referred to as STAs for short, and STAs used as APs are referred to as APs.

In order to increase network throughput and improve QoS (Quality of Service, quality of service), a direct connection method has been formulated in the prior art, which allows two QoS-supporting STAs associated to the same AP to perform direct connection communication. The existing direct connection methods mainly include two types, namely, a direct connection method that requires the participation of an AP and a direct connection method that does not require the participation of the AP. In the direct connection method that does not require the participation of the AP, the information related to the establishment of the direct connection is encapsulated in a data frame and transparently transmitted between the STAs through the AP, which is also called the tunnel-type direct connection establishment method.

In the process of implementing the present invention, the inventor found that the implementation in the prior art has the following problem: According to the provisions of the prior art, the STA cannot be in the power saving mode after being directly connected. This causes two STAs in the same BSS to consume power faster when they communicate with each other when the network QoS is poor, reducing the effective working time of the device battery.

Contents of the invention

Embodiments of the present invention provide a method, system and device for data transmission in a direct connection path, which are used to enable STAs in a direct connection state in a wireless local area network to use a power saving mode for data transmission.

An embodiment of the present invention provides a method for data transmission in a direct path, which is applied to a first STA and a second STA that have established a direct connection, including:

The first STA receives a request message carrying transport stream parameters sent by the second STA, where the transport stream parameters carry parameters related to power-saving transmission;

The first STA generates a response message according to the transmission stream parameter and sends it to the second STA;

The first STA and the second STA perform data transmission in a power saving mode according to the transmission stream parameters.

Embodiments of the present invention also provide a system for data transmission in a direct path, including a first STA and a second STA that have established a direct connection,

The first STA is configured to receive a request message carrying a transport stream parameter sent by the second STA, where the transport stream parameter carries parameters related to power-saving transmission; and generate a response message according to the transport stream parameter and send the request message to the The second STA sends; the first STA and the second STA perform data transmission in a power saving mode according to the transmission stream parameters.

Embodiments of the present invention also provide an STA device, including:

The request message receiving unit is configured to receive a request message carrying transmission stream parameters sent by a second STA directly connected to it, where the transmission stream parameters carry parameters about power-saving transmission;

a response message generating unit, configured to generate a response message according to the transport stream parameters in the request message received by the request message receiving unit;

a response message sending unit, configured to send the response message generated by the response message generating unit to the second STA;

A data transmission unit, configured to perform data transmission with the second STA in a power saving mode according to the transmission stream parameters.

Embodiments of the present invention also provide an STA device, including:

a request message generating unit, configured to generate a request message carrying transport stream parameters, where the transport stream parameters carry parameters related to power-saving transmission;

a request message sending unit, configured to send the request message generated by the request message generating unit to the first STA directly connected to it;

A data transmission unit, configured to perform data transmission with the first STA in a power saving mode according to the transmission stream parameters.

Compared with the prior art, the embodiments of the present invention have the following advantages:

On the direct connection path, the negotiation of power-saving transmission mechanism between directly connected STAs is realized, which ensures the data transmission when STAs are directly connected. STAs can enter the power-saving mode and can guarantee QoS, saving the energy of STAs in the case of direct connection consume.

Description of drawings

Fig. 1 is a flowchart of a data transmission method in a direct connection path in an embodiment of the present invention;

FIG. 2A is a flowchart of STA1 receiving data from an AP using a reserved automatic power-saving transmission mechanism in an embodiment of the present invention;

FIG. 2B is a flow chart of STA1 receiving data from an AP using a non-reserved automatic power-saving transmission mechanism in an embodiment of the present invention;

3 is a flowchart of a data transmission method in a direct connection path in an embodiment of the present invention;

4 is a schematic diagram of a system used for data transmission in a direct path in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an STA in an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an STA in an embodiment of the present invention.

Detailed ways

The STA in the embodiment of the present invention includes two working modes: active mode and power saving mode. When STA is in active mode, it can receive and send data normally. The STA in power saving mode has two working states: awake state and sleep state. When the STA is in the awake state, it can receive and send data normally; when the STA is in the sleep state, the STA is in a low power consumption state and cannot receive and send data.

An embodiment of the present invention provides a method for data transmission in a direct connection path, which is applied to a first STA and a second STA that have established a direct connection, as shown in FIG. 1 , including the following steps:

Step s101 , the first STA receives a request message carrying transmission stream parameters sent by a second STA, and the transmission stream parameters carry parameters related to power-saving transmission.

Specifically, the parameters related to power-saving transmission carried in the transmission stream parameters include: automatic power-saving transmission indicator bit and/or reservation indicator bit; when the automatic power-saving transmission indicator bit is set, it indicates that the automatic power-saving transmission mode needs to be used, otherwise In order not to use the automatic power saving transmission mode; when the reservation indicator bit is set, it means that the reservation mode needs to be used, otherwise, the reservation mode is not needed.

Step s102, the first STA generates a response message according to the transmission stream parameters and sends it to the second STA.

Specifically, the first STA sets the determined automatic power-saving transmission mode in the response message according to the power-saving transmission parameters set by the second STA in the request message in combination with its own power-saving state, and receives or rejects the second STA's request, generates Respond to the message.

Step s103 , the first STA and the second STA perform data transmission using the power saving mode according to the transmission stream parameters.

A specific implementation manner of the present invention is described below in conjunction with a specific application scenario. Take the network including AP, STA1 and STA2 as an example. STA1 is the receiver, and STA2 is the sender.

The automatic power-saving transmission in the BSS networking mode includes reserved power-saving transmission and non-reserved power-saving transmission. The basic process of the reserved power-saving transmission method is as follows: when a STA establishes a downlink transmission flow with an AP, it negotiates with the AP on parameters such as the start transmission time, transmission service period, and transmission interval of the transmission flow. The transmission start time indicates the time point when the AP transmits data to the STA for the first time, the transmission service period refers to the maximum duration of each transmission period, and the transmission interval period refers to the interval between two transmission periods. Once the negotiation is completed, the AP will send data to the STA at a fixed time point, so the STA only needs to wake up to receive data at a fixed time point. After a transmission process ends, the STA can immediately enter the sleep state and calculate the next time to wake up.

Specifically, it is taken as an example that STA1 receives data from the AP by using the reserved automatic power saving transmission mechanism before the direct connection. The process of receiving data is shown in Figure 2A, including the following steps:

In step s201 , the AP and STA1 negotiate the transmission parameters used in the transmission stream.

Specifically, the transmission parameters include parameters such as start transmission time, transmission service period, and transmission interval. The transmission start time indicates the time point when the AP transmits data to STA1 for the first time, the transmission service period refers to the maximum duration of each transmission period, and the transmission interval period refers to the interval between two transmission periods.

In step s202, STA2 sends the data to the AP when there is data to be sent to STA1.

Step s203, since STA1 is in the power saving mode, the AP buffers the data for STA1.

Step s204, STA1 wakes up at the appointed time point, and waits to receive data.

Specifically, STA1 wakes up at the time point of starting transmission agreed with the AP according to the transmission parameters negotiated with the AP. In order to ensure that the data can be received when the AP starts to transmit data, STA1 should actually wake up a little earlier than the appointed time.

In step s205, the AP transmits data to STA1 at the same agreed time point.

Specifically, according to the transmission parameters negotiated with STA1 , the AP sends the previously buffered data to STA1 at the time point of starting transmission agreed with STA1 .

In step s206, STA1 enters the dormant state again after receiving the data.

The basic process of the non-reserved power-saving transmission method is as follows: when the STA establishes a downlink transmission flow with the AP, it instructs the AP to adopt the non-reserved automatic power-saving transmission method. Specifically, setting the automatic power saving transmission indication bit to 1 indicates yes, and setting the automatic power saving transmission indication bit to 0 indicates no. When using the non-reserved automatic power-saving transmission method, the STA wakes up at a time determined by itself, and sends a trigger frame to the AP after contending for the channel, triggering the AP to transmit data to the STA. After a transmission is completed, the STA continues to sleep. The main feature of the non-reserved power-saving transmission method is that the wake-up time point of the STA is not agreed in advance, and the AP sends data to the STA after receiving the trigger frame from the STA.

Specifically, it is taken as an example that STA1 receives data from the AP using the non-reserved automatic power-saving transmission mechanism before the direct connection. The process of receiving data is shown in Figure 2B, including the following steps:

In step s211 , the AP and the STA1 negotiate the transmission parameters used for the transmission stream, specifying to use the non-reserved automatic power-saving transmission mode.

In step s212, STA2 sends the data to the AP when there is data to be sent to STA1.

Step s213, because STA1 is in the power saving mode, the AP buffers the data.

Step s214, STA1 wakes up at an indeterminate time point.

Step s215, STA1 sends a trigger frame to the AP. According to the provisions of the 802.11 protocol, the trigger frame can be a PS-Poll (poll frame for power saving mode) frame, or a pre-defined type of data frame sent from the STA to the AP.

In step s216, after receiving the trigger frame, the AP sends the previously buffered data frame to STA1.

In step s217, STA1 enters the dormant state again after receiving the data.

The above power-saving transmission mechanism effectively guarantees the QoS guarantee required by the transmission stream established by the STA in the power-saving mode. If STA1 finds that the QoS is deteriorating, and establishes a direct connection with STA2 in order to better receive data from STA2, the embodiment of the present invention does not limit the method for establishing the direct connection. After the direct connection is established, as shown in FIG. 3 , follow the steps below so that STA1 can use the automatic power saving transmission mechanism to receive data from STA2 on the direct connection path.

Step 301, STA2 sends a request message carrying a TS to STA1.

The request message carrying the TS may be an ADDTS (add transmission stream) message, and the transmission stream (Transmission Stream, TS) has four directions: uplink to AP, downlink from AP, bidirectional, and direct path. Regardless of the direction of the TS, the ADDTS message is sent by the STA to the AP. At the same time, only the TS sender can send ADDTS messages to the AP on the direct path.

In the ADDTS message, two bits can be used to indicate the direction of the TS. In this way, the above four possible directions of the TS have exhausted the combinations that can be expressed by the two bits. The embodiment of the present invention is described by using an STA as a TS sending end to send an ADDTS message to an TS receiving end STA on a direct path. In fact, the effect of sending the ADDTS message from the TS receiving end STA to the TS sending end STA is the same.

Many parameters are carried in the ADDTS message, such as whether to use automatic power saving transmission mode, whether to use reservation mode, maximum and minimum transmission interval, maximum and minimum transmission service period, etc. When the STA adds a TS to the AP, it is completely up to the STA to decide which transmission mode to use. However, when ADDTS is used on the direct path, since both sides of the link are STAs, it is inappropriate for the STA as the TS sender to determine the transmission mode unilaterally, and it should be the result of negotiation between the two STAs.

If STA2 sets the automatic power-saving transmission indication position to 0 in the ADDTS request (at this time, the indication of whether to reserve is meaningless), it means that STA1 can only use the normal transmission mode to receive data, because STA2 is in power-saving mode, and cannot guarantee wakes up at the time point, STA2 can only transmit data to STA1 at an uncertain time point. This means STA1 cannot be in power saving mode.

If STA2 sets both the automatic power saving transmission indication bit and the reserved indication bit to 1 in the ADDTS request, it means that if STA1 wants to use the automatic power saving transmission mechanism, it can only use the reserved automatic power saving transmission mode, because STA2 is in the power saving mode. Battery mode, and can guarantee to wake up at the scheduled time. At this time, if STA1 is also in the power saving mode, use the reserved automatic power saving transmission mode to receive data, that is, both parties wake up and transmit at the same time; if STA1 is in active mode, use the normal transmission mode to receive data, that is, STA2 is in any Data can be transmitted to STA1 after waking up at any time.

If STA2 sets the automatic power saving transmission indication position to 1 and the reservation indication position to 0 in the ADDTS request, it means to inform STA1 that STA2 will always be in active mode. At this time, if STA1 is in power saving mode, STA1 can use In the non-reserved automatic power-saving transmission mode, STA1 triggers STA2 to transmit data to STA1 when STA1 wakes up. Of course, the reserved automatic power-saving transmission mode can also be used to receive data; if STA1 is in active mode, use normal transmission mode to receive data.

In step s302, STA1 sends a response message to STA2 after receiving the request message from STA2.

Specifically, STA1 sets the automatic power saving transmission and reservation information bits in the response message according to the automatic power saving transmission, reservation indication information set by STA2, and its own status according to the rules described above. STA1 may have to change its own power-saving state (such as power-saving mode or active mode), for example, when STA2 is already in power-saving mode and cannot reserve a wake-up time point, if STA1 is also in power-saving mode, it must be changed to active mode. If STA1 has to change whether the power saving state is but does not want to or cannot change, then reject the ADDTS request of STA2. After STA2 is rejected, it can change its own power saving status and request ADDTS again.

In step s303, STA1 requests STA2 to switch to an idle channel different from the basic channel used by the AP.

Switching to an idle channel is necessary for automatic power-saving transmission mechanisms using reservations on direct paths, while switching to idle channels is not necessary for other transmission mechanisms.

Because using the reserved automatic power-saving transmission mechanism in the basic channel on the direct path without modifying the existing technology will conflict with the AP, causing STA2 and the AP to transmit data at the same time, so the direct path must be switched to An idle channel can use the reserved automatic power saving transmission mechanism. As for how STA1 selects an idle channel is not within the scope of the present invention, further, how to switch to an idle channel is not the focus of the present invention, which will not be repeated here.

Step s304, STA1 and STA2 use the power saving mode to transmit data according to the transmission stream parameters.

In addition, it should be noted that in specific implementation, the ADDTS message may not be used, but a new message may be defined separately. When the newly defined message is used, the specific implementation manner of the present invention is similar to the above-mentioned implementation manner using the ADDTS message, and repeated description is not repeated here.

Through the above method provided by the present invention, the negotiation of the power-saving transmission mechanism between directly connected STAs is realized on the direct connection path, and the data transmission during the direct connection of the STAs is guaranteed. The STAs can enter the power-saving mode and can guarantee QoS, saving Energy consumption of STAs in direct connection. Moreover, since STAs will use the direct data transmission method, the steps of STAs sending data to APs are saved, and APs can use the original data forwarding time between STAs to serve other applications, improving the efficiency of the system.

Embodiments of the present invention also provide a data transmission system in a direct path, as shown in FIG. 4 , including a first STA 10 and a second STA 20 that have established a direct connection. Wherein, the first STA 10 receives the request message carrying the TS sent by the second STA 20, and the TS carries parameters about power-saving transmission; the first STA 10 generates a response message according to the TS and sends it to the second STA 20.

Specifically, as shown in Figure 5, the first STA 10 includes:

The request message receiving unit 11 is configured to receive a request message carrying a TS sent by the second STA 20 directly connected to it, and the TS carries parameters about power-saving transmission. The parameters about power-saving transmission carried in the TS include: automatic power-saving transmission indication bit, and/or reservation indication bit; Power-saving transmission mode; when the reservation indicator bit is set, it means that the reservation mode needs to be used, otherwise the reservation mode is not needed.

The response message generating unit 12 is configured to generate a response message according to the TS in the request message received by the request message receiving unit 11 .

The response message sending unit 13 is configured to send the response message generated by the response message generating unit 12 to the second STA 20.

The switching request sending unit 14 is configured to request the second STA 20 to switch to an idle channel after the response message sending unit 13 sends the response message.

The data transmission unit 15 is configured to perform data transmission with the second STA 20 using the power saving mode according to the TS carried in the message received by the request message receiving unit 11.

Specifically, as shown in Figure 6, the second STA 20 includes:

The request message generating unit 21 is configured to generate a request message carrying a TS, and the TS carries parameters related to power-saving transmission. The parameters about power-saving transmission carried in the TS include: automatic power-saving transmission indication bit, and/or reservation indication bit; Power-saving transmission mode; when the reservation indicator bit is set, it means that the reservation mode needs to be used, otherwise the reservation mode is not needed.

The request message sending unit 22 is configured to send the request message generated by the request message generating unit 21 to the first STA directly connected thereto.

The data transmission unit 23 is configured to perform data transmission with the first STA 10 using the power saving mode according to the TS carried in the message generated by the request message generating unit 21.

The above-mentioned request message generation unit 21 includes:

The first request message generation subunit 211 is used for the automatic power saving transmission indication bit in the TS is not set, indicating that the first STA 10 is requested to use the normal transmission mode to receive data.

The second request message generation subunit 212 is used to set the automatic power saving transmission indication bit in the TS and the reserved indication position to indicate that the first STA 10 is requested to use the reserved automatic power saving transmission mode to receive data, or to use the normal transmission mode Receive data.

The third request message generation subunit 213 is used to indicate that the first STA 10 is requested to receive data in a non-reserved automatic power saving transmission mode when the automatic power saving transmission indication bit in the TS is set and the reserved indication bit is not set, or Receive data in scheduled automatic power-saving transfer mode, or use normal transfer mode to receive data.

Through the above-mentioned system and equipment provided by the present invention, the negotiation of the power saving transmission mechanism between directly connected STAs is realized on the direct connection path, and the data transmission during the direct connection of the STAs is guaranteed. The STAs can enter the power saving mode and can guarantee QoS. This saves the energy consumption of STAs in the case of direct connection. Moreover, since STAs will use the direct data transmission method, the steps of STAs sending data to APs are saved, and APs can use the original data forwarding time between STAs to serve other applications, improving the efficiency of the system.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solution of the present invention It can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), and include several instructions to make a computer device (which can be It is a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (13)

1, the method for transfer of data in a kind of direct access path is applied to comprise and has set up a direct-connected STA and the 2nd STA, it is characterized in that, comprising:

A described STA receives the request message that carries the transport stream parameter that described the 2nd STA sends, and carries about the power saving transmission parameters in the described transport stream parameter;

A described STA generates response message according to described transport stream parameter and sends to described the 2nd STA;

A described STA and described the 2nd STA use battery saving mode to carry out transfer of data according to described transport stream parameter.

2, the method for claim 1 is characterized in that, a described STA generates response message according to described transport stream parameter and after described the 2nd STA sends, also comprises:

A described STA asks described the 2nd STA to switch to idle channel.

3, the method for claim 1 is characterized in that, that carries in the described transport stream parameter comprises about the power saving transmission parameters: automatic power save transmission indicating bit and/or reservation indicating bit;

When described automatic power save was transmitted indicating bit set, expression needed to use the automatic power save transmission mode, otherwise for not needing to use the automatic power save transmission mode;

During described reservation indicating bit set, expression needs to use the reservation pattern, otherwise for not needing to use the reservation pattern.

4, method as claimed in claim 3 is characterized in that, during set, described request message does not represent that described the 2nd STA asks a described STA to use the normal transmission pattern to receive data to automatic power save in described transport stream parameter transmission indicating bit.

5, method as claimed in claim 3, it is characterized in that, when automatic power save transmission indicating bit set in the described transport stream parameter and described reservation indicating bit set, described request message represents that described the 2nd STA asks a described STA to use the automatic power save transmission mode of reservation to receive data or use normal transmission pattern receives data.

6, method as claimed in claim 3, it is characterized in that, during set, described request message does not represent that the automatic power save transmission mode that described the 2nd STA asks a described STA to use the automatic power save transmission mode of non-reservation to receive data or reservation receives data or uses the normal transmission pattern to receive data for transmission indicating bit set of automatic power save in the described transport stream parameter and described reservation indicating bit.

As each described method in the claim 1,4,5 or 6, it is characterized in that 7, a described STA generates response message according to described transport stream parameter and comprises:

A described STA receives or refuses the request of described the 2nd STA, and generates response message.

8, the method for claim 1 is characterized in that, described request message is for adding transport stream ADDTS request message, and described response message is for adding transport stream ADDTS response message.

9, the system of transfer of data in a kind of direct access path is characterized in that, comprise setting up a direct-connected STA and the 2nd STA,

A described STA is used to receive the request message that carries the transport stream parameter that described the 2nd STA sends, and carries about the power saving transmission parameters in the described transport stream parameter; And according to described transport stream parameter generation response message and to described the 2nd STA transmission; A described STA and described the 2nd STA use battery saving mode to carry out transfer of data according to described transport stream parameter.

10, a kind of STA equipment is characterized in that, comprising:

The request message receiving element is used to receive the request message that carries the transport stream parameter that two STA direct-connected with it sends, and carries about the power saving transmission parameters in the described transport stream parameter;

The response message generation unit is used for the transport stream parameter generation response message according to the request message of described request message sink unit reception;

The response message transmitting element is used for the response message that described response message generation unit generates is sent to described the 2nd STA;

Data transmission unit is used for according to described transport stream parameter, uses battery saving mode to carry out transfer of data with described the 2nd STA.

11, as STA equipment as described in the claim 10, it is characterized in that, also comprise:

The handoff request transmitting element is used for asking described the 2nd STA to switch to an idle channel after described response message transmitting element sends response message.

12, a kind of STA equipment is characterized in that, comprising:

The request message generation unit is used to generate the request message that carries the transport stream parameter, carries about the power saving transmission parameters in the described transport stream parameter;

The request message transmitting element, the request message that is used for the described request message generation unit is generated sends to a STA direct-connected with it;

Data transmission unit is used for according to described transport stream parameter, uses battery saving mode to carry out transfer of data with a described STA.

13, as STA equipment as described in the claim 12, it is characterized in that the described request message generation unit comprises:

First request message generates subelement, is used for the not set of automatic power save transmission indicating bit with described transport stream parameter, represents that a described STA uses the normal transmission pattern to receive data;

Second request message generates subelement, be used for automatic power save transmission indicating bit set and the set of reservation indicating bit, represent that a described STA uses the automatic power save transmission mode reception data of reservation or uses the normal transmission pattern to receive data described transport stream parameter;

The 3rd request message generates subelement, be used for the transmission indicating bit set of the automatic power save of described transport stream parameter and reservation indicating bit not during set, the automatic power save transmission mode that the described STA of expression request uses the automatic power save transmission mode of non-reservation to receive data or reservation receives data or uses the normal transmission pattern to receive data.

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